/**
 * ui.js — Утилиты форматирования, отображения статусов и DOM-элементов
 */

export const MAX_FILE_SIZE = 25 * 1024 * 1024;
export const ACCEPTED_TYPES = new Set([
  "image/jpeg",
  "image/jpg",
  "image/png",
  "image/webp",
  "image/heic",
  "image/heif",
]);

export function isHeicFile(file) {
  const type = String(file?.type || "").toLowerCase();
  const name = String(file?.name || "").toLowerCase();
  return (
    type === "image/heic" ||
    type === "image/heif" ||
    name.endsWith(".heic") ||
    name.endsWith(".heif")
  );
}

export function formatFileSize(bytes) {
  if (!bytes || bytes <= 0) return "";
  const units = ["Б", "КБ", "МБ", "ГБ"];
  let value = bytes;
  let unitIndex = 0;
  while (value >= 1024 && unitIndex < units.length - 1) {
    value /= 1024;
    unitIndex++;
  }
  return `${value.toFixed(value >= 10 || unitIndex === 0 ? 0 : 1)} ${units[unitIndex]}`;
}

export function versionFileName(version) {
  const dateStr = version?.createdAt
    ? new Date(version.createdAt).toISOString().replace(/[:.]/g, "-").slice(0, 19)
    : "photo";
  const ext = version?.ext || "jpg";
  const label = version?.label ? version.label.replace(/[^\p{L}\p{N}._-]+/gu, "-") : "version";
  return `kadr-${label}-${dateStr}.${ext}`;
}

export function formatHistoryDate(iso) {
  if (!iso) return "";
  try {
    const d = new Date(iso);
    const date = d.toLocaleDateString("ru-RU", {
      day: "numeric",
      month: "short",
    });
    const time = d.toLocaleTimeString("ru-RU", {
      hour: "2-digit",
      minute: "2-digit",
    });
    return `${date}, ${time}`;
  } catch {
    return iso;
  }
}

export function setJobStatus(kind, message) {
  const jobStatus = document.querySelector("#job-status");
  const jobStatusText = document.querySelector("#job-status-text");

  if (!jobStatus || !jobStatusText) return;

  if (kind === "idle") {
    jobStatus.hidden = true;
    jobStatus.classList.remove("status-error");
    jobStatusText.textContent = "";
    return;
  }

  jobStatus.hidden = false;
  jobStatus.classList.toggle("status-error", kind === "error");
  jobStatusText.textContent = message;
}

export function resetResult() {
  const resultImage = document.querySelector("#result-image");
  const resultPlaceholder = document.querySelector("#result-placeholder");
  const resultLabel = document.querySelector("#result-label");
  const downloadLink = document.querySelector("#download-link");

  if (resultImage) {
    resultImage.hidden = true;
    resultImage.removeAttribute("src");
  }
  if (resultPlaceholder) resultPlaceholder.hidden = false;
  if (resultLabel) resultLabel.textContent = "";
  if (downloadLink) downloadLink.hidden = true;
}

export function clearSourcePreview() {
  const sourceImage = document.querySelector("#source-image");
  const sourcePlaceholder = document.querySelector("#source-placeholder");
  const downloadCurrent = document.querySelector("#download-current");

  if (sourceImage) {
    sourceImage.hidden = true;
    sourceImage.removeAttribute("src");
  }
  if (sourcePlaceholder) sourcePlaceholder.hidden = false;
  if (downloadCurrent) downloadCurrent.hidden = true;
}

export function showSourcePreview(url, title, meta) {
  const sourceImage = document.querySelector("#source-image");
  const sourcePlaceholder = document.querySelector("#source-placeholder");
  const dropTitle = document.querySelector("#drop-title");
  const fileMeta = document.querySelector("#file-meta");

  if (sourceImage) {
    sourceImage.src = url;
    sourceImage.hidden = false;
  }
  if (sourcePlaceholder) sourcePlaceholder.hidden = true;
  if (dropTitle && title) dropTitle.textContent = title;
  if (fileMeta && meta) fileMeta.textContent = meta;
}

export function updateDownloadCurrent(version) {
  const downloadCurrent = document.querySelector("#download-current");
  if (!downloadCurrent) return;

  if (!version || !version.url) {
    downloadCurrent.hidden = true;
    return;
  }

  downloadCurrent.href = version.url;
  downloadCurrent.download = versionFileName(version);
  downloadCurrent.hidden = false;
}